Method for preparing anode material of lithum ion battery by using solvent-nonsolvent

Abstract

First, with the proportioning materials being prepared, the mechanical ball milling method is utilized to mix the materials evenly. With the deionized water being added, the said admixture is stirredup to obtain the solution of the materials. The prepared solution is filled to the non-aqueous organic solvent slowly ty obtain the predecessor in fine crystal. With the predecessor being vacuum dried, the anode material of lithium ion battery is obtained by sintering the predecessor in 3-10 hours at 500-1200 deg.C. The invention features the low sintering temperature and time, the even granule (100nm-700nm) of the material and good electrochemistry performances.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries refer to secondary batteries in which lithium-ion intercalation compounds are positive and negative electrodes. Compared with traditional secondary batteries such as cadmium-nickel and nickel-metal hydride batteries, lithium-ion batteries have a high working voltage (up to 3.6-3.7V) , high volume and mass specific energy, no memory effect, small self-discharge, long cycle life and environmental friendliness, etc., which meet the development requirements of miniaturization, light weight and high energy for the rapid development of mobile communication and information technology Since Japan's Sony Corporation developed lithium-ion batteries in 1990, there has been an upsurge in research and industrialization of lithium-ion batteries worldwide, and it has developed rapidly as...

AI Technical Summary

Problems solved by technology

Before the present invention was made, the preparation of lithium-ion battery electrode anode materials mainly used solid phase reaction method, molten salt impregnation method, sol-gel method, Pechini method, hot pressing synthesis method, hydrothermal synthesis method and co-precipitation method, etc., Among them, the solid-phase reaction method is the main industrial production method at present. The compound of lithium and cobalt, manganese or nickel is thoroughly ground and mixed repeatedly, and then roasted at high temperature to obtain the product. The operation process is simple, the raw material is easy to obtain, and the product crystal form is relatively Good, but the reaction time is long (tens of hours to several days), the temperature is high (800-1200°C), and temperature is the only controlling factor, it is relatively difficult to control the reactants, the grain size of the product is uneven, and the product is consistent Poor performance, low electrochemical activity